Who is 'New Jihadi John' Siddhartha Dhar?

The US State Department has designated two ISIS members, Siddhartha Dhar and Abdelatif Gaini, as Specially Designated Global Terrorists under Section 1(b) of Executive Order which also imposes sanctions on foreign persons determined to have committed or pose a significant risk of committing acts of terrorism that threaten the security of US nationals, the national security, foreign policy, or economy of the US.